SCIENTIFIC EXPEDITION TO NORTHWESTERN COLORADO 



x 47 



Rifle Gap 



Halymenites major Lesquereux 

 Serpula tnarkmani Henderson 

 Bryozoan undetermined 

 Inoceramus sagensis Owen 

 Avicula linguiformis E. and S. 

 Syncyclonema rigida H. and M. 

 Liopistha undata M. and H. 

 Leptosolen sp. 

 Gyrodes sp. 



Lunatia concinna H. and M. 

 Anchura americana E. and S. 

 Odontobasis? sp. 

 Cylichna volvaria ? M. and H. 

 Gastropods undetermined 

 Bacidites compressus Say 

 Ptychoceras sp. 

 Placenticeras sp. 



Meeker 

 Panopcea berthoudi White 

 Inoceramus cripsi barabini Morton 

 Inoceramus sagensis Owen 

 Avicula nebrascana E. and S. 

 Avicula linguiformis E. and S. 

 Ostrea sp. 



Syncyclonema rigida H. and M. 

 Mytilus subarcuatus M. and H. 

 Goniomya americana M. and H. 

 Thracia gracilis M. and H. 

 Liopistha undata M. and H. 

 Eriphyla gregaria ? M. and H. 

 Lucina sp. 



Sphceriola? cordata M. and H. 

 Legumen ? sp. 

 Leptosolen? sp. 

 Lunatia sp. 

 Spironema ? sp. 

 Cylichna sp. 



Gastropods undetermined 

 Baculites compressus Say 

 Baculites ovatus Say 

 Scaphites nodosus Owen 

 Placenticeras intercalare M. and H. 

 Fish scales 



Between the lowest and next to the lowest well-marked sandstone 

 ledges of the Mesa Verde on the east side of Rifle Gap. 



Ostrea subtrigonalis E. and S. 

 Cardium speciosum M. and H. 

 Mactra ci.formosa M. and H. 

 Gyrodes sp. 



Lunatia sp. 

 Odontobasis sp. 

 Gastropods undetermined 



Above next to the lowest well-marked sandstone ledge of the Mesa 

 Verde and not far below the lowest coal vein on the east side of Rifle 

 Gap. 



Ostrea subtrigonalis E. and S. 

 Anomia rcetiformis Meek 

 Corbicula occidentalis M. and H. 



In the lower Mesa Verde sandstones on Piceance Creek above Rio 

 Blanco Stage Station. 



Halymenites major Lx. 



